Catalyst for polyester production, process for producing...

Details Catalyst for polyester production, process for producing... Catalyst for polyester production, process for producing...

2004-09-16

2008-11-11

Boykin, Terressa (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C524S779000, C524S780000, C524S781000, C524S787000, C524S783000, C524S784000, C524S785000, C524S786000, C524S788000, C524S789000, C528S272000, C528S274000, C528S277000, C528S280000, C528S281000, C528S282000, C528S283000, C528S285000, C528S286000, C528S308000, C528S308100, C528S308200, C528S308300

Reissue Patent

active

RE040571

ABSTRACT:
The present invention provides a catalyst for polyester production capable of producing a polyester with high catalytic activity, a process for producing a polyester using the catalyst and a polyester produced thereby. The catalyst comprises a solid titanium compound obtained by dehydro-drying a hydrolyzate obtained by hydrolysis of a titanium halide and which has a molar ratio (OH/Ti) of a hydroxyl group (OH) to titanium (Ti) exceeding 0.09 and less than 4. In the process, the polyester is obtained by polycondensing an aromatic dicarboxylic acid, or an ester-forming derivative thereof, and an aliphatic diol, or ester-forming derivative thereof, in the presence of the catalyst. The resulting polyester has excellent transparency and tint, a titanium content of 1 to 100 ppm, a magnesium content of 1 to 200 ppm and a magnesium to titanium weight ratio of not less than 0.01.

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